Surface grinding machine



FIG. 1 is a front perspective view of a surface grinding machine showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a right side view taken from the right of FIG. 1;

FIG. 5 is a side view taken from the left of FIG. 1; and

FIG. 6 is a back view thereof. 

The ornamental design for a surface grinding machine, as shown. 